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3 Cards in this Set
- Front
- Back
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Explain ventricles |
Each cerebral hemisphere contains relatively large cavities (ventricles). The lateral ventricles are separated from each other by a thin membrane called the septum pellucidum (Thought of as the 1st and 2nd ventricles) The third ventricle is a smaller cavity located at the midline between the two halves of the thalamus. The fourth ventricle is in the inferior part of the pontine region and the superior region of the medulla oblongata at the base of the cerebellum. It is continuous with the central canal of the spinal cord, which extends nearly the full length of the cord. |
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Explain the formation and circulation of cerebrospinal fluid |
Each of the four ventricles leaked our blood plasma/CSF fluid. Blood vessels leak through ependymal cells, has to be out of ependymal cells and into ventricles to be called CSF fluid, if not it's called blood plasma. Subarachnoid space then holds it, functions as great shock absorber for the brain. (Provides little nutrition- glucose, o2, and provides protection) Arachnoid granulation has holes in it which CSF flows through it into the blood stream, becoming blood plasma again. Average of 80-150ml of CSF fluid. |
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List the 5 steps of CSF flow |
Starts out as blood plasma. 1. CSF fluid is produced by the choroid plexuses of each of the four ventricles. 2. CSF from the lateral ventricles flows through the intervertebral foramina to the 3rd ventricle. 3. CSF flows from the 3rd ventricle through the cerebral aqueduct to the 4th ventricle. 4. CSF exits the 4th ventricle through the lateral & median apertures & enters the subarachnoid space. Some CSF enters the canal of the spinal cord. 5. CSF flows through the subarachnoid space to the arachnoid granulations in the superior sagital sinus, where it enters the venous circulation. |
